GEAR

To suppress deterioration of gear tooth contact.SOLUTION: A gear 100 comprises a boss part 1, an intermediate part 4 provided on the outer periphery of a boss part 1 in which end part 4a on an inner peripheral side is connected to the boss part 1, and a tooth forming part 2 having a plurality of teeth 3 connected to the outer peripheral side end part 4b of the intermediate part 4 and meshing with other gears 9 on the outer periphery. In the intermediate part 4, the rigidity of a tooth contact start part 3a at which a tooth 3 starts to mesh with another gear 9 is higher than the rigidity of a tooth contact end part 3b at which the tooth 3 meshes with the other gear 9 following the tooth contact start part 3a.SELECTED DRAWING: Figure 1 【課題】歯車の歯当りの悪化を抑制する。【解決手段】歯車１００は、ボス部１と、内周側の端部４ａがボス部１に連結されてボス部１の外周に設けられる中間部４と、中間部４の外周側の端部４ｂが連結され、外周に他の歯車９と噛み合う歯３を複数有する歯形成部２と、を備え、中間部４は、歯３が他の歯車９と噛み合い始める歯当り始め部３ａの剛性が、歯当り始め部３ａよりも後で歯３が他の歯車９と噛み合う歯当り終り部３ｂの剛性よりも高い。【選択図】図１